This rubber knob for the BWG-Pro, BWG-ProB & BWG-Pro2B controlling the top swing arm and bottom panning controls.
If you have an original early BWG-Pro the panning base control knob had a slightly longer thread, to check this, we advise you to take the top knob of and try it in the panning base to see if it locks the panning base, if the top knob does not lock the panning base please inform us and we will supply a longer threaded knob, which will require you to either cut/grind the threaded length down to size or get someone local to you to do this, you will need to take your Pro head with you to make sure the threaded knob is cut to the right length.
